期刊
PHYSICAL REVIEW B
卷 80, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.144512
关键词
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资金
- Korea Science and Engineering Foundation through Acceleration Research [R17-2008-007-01001-0]
- POSTECH Research
We investigated the temperature dependence of the upper critical field [H-c2(T)] of fluorine-free SmFeAsO0.85 and fluorine-doped SmFeAsO0.8F0.2 single crystals by measuring the resistive transition in low static magnetic fields and in pulsed fields up to 60 T. Both crystals show that H-c2(T)'s along the c axis [H-c2(c)(T)] and in an ab-planar direction [H-c2(ab)(T)] exhibit a linear and a sublinear increase, respectively, with decreasing temperature below the superconducting transition. H-c2(T)'s in both directions deviate from the conventional one-gap Werthamer-Helfand-Hohenberg theoretical prediction at low temperatures. A two-gap nature and the paramagnetic pair-breaking effect are shown to be responsible for the temperature-dependent behavior of H-c2(c) and H-c2(ab), respectively.
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